Pilot Program on the Application of Electronic Resettable Sectionalizers to Improve Reliability
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Pilot Program on the Application of Electronic Resettable Sectionalizers to Improve Reliability SWEDE Conference May 1, 2008 Van Nguyen [email protected] Pilot Program Review. Circuit History on Hockley (HK) -04 and -06 Circuit Demographics Reliability Performance

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Pilot Program on the Application of Electronic Resettable Sectionalizers to Improve Reliability

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Pilot Program on the Application of Electronic Resettable Sectionalizers to Improve Reliability

SWEDE Conference

May 1, 2008

Van Nguyen

[email protected]


Pilot Program Review

  • Circuit History on Hockley (HK) -04 and -06

    • Circuit Demographics

    • Reliability Performance

  • Root Cause Analysis on Circuit Operations and Fuse Outages

    • Review of Outage Data in Early 2005

    • Potential Solutions

  • Course of Action for Electronic Resettable Sectionalizers (ERS )

    • Functions

    • Advantages

    • Safety Concerns

    • Implemented by Early 2006

    • Education

  • Performance Results for 2006 and 2007


Circuit History

  • Circuit Demographics on HK-04 and HK-06

    • 12 kV circuits

    • Rural, agricultural areas

    • No static construction

    • Low customer count

      • HK-04 – 1,000 customers

      • HK-06 – 465 customers


HK-04 Lateral


Circuit History (con’t)

  • Reliability Performance on HK-04

    • 10% SAIDI circuit in 2003, 2004 and 2005

    • Excessive circuit operations in 2004

    • 9 specific fuses accounted for 60% of total circuit SAIDI minutes from potential temporary events (lightning, wind, wildlife, etc…) in 2004

    • Similar performance in 2003 and 2005


Circuit History (con’t)

  • Reliability Performance on HK-06

    • 10% SAIDI circuit in 2004 and 2005

    • Excessive circuit operations in 2004

    • 5 specific fuses accounted for 58% of total circuit SAIDI minutes from potential temporary events in 2004


Root Cause Analysis

  • Review of Outage Data in Early 2005

    • 60% (HK-04) and 58% (HK-06) of total circuit SAIDI mins from potential temporary events in 2004

    • Excessive circuit operations in 2004

      • HK-04 – 27 operations

      • HK-06 – 36 operations

    • Source of excessive operations unknown

    • Fault current data ( < 1kA to > 4kA ) from relays indicated activities may be at multiple points


Root Cause Analysis (con’t)

  • Review of Outage Data in Early 2005

    • Lightning analysis investigation

      • No static construction

      • Flat, grasslands, agricultural areas

      • Temporary events such as lightning and wind

      • Erratic fault current values

      • Correlation between outages and lightning strikes


Mapping of Hockley Circuits


Lightning Data Plot for 2004


Root Cause Analysis (con’t)

  • Investigation of Potential Solutions

    • Installation of lightning arresters

      • Effective but costly

    • Installation of static neutral

      • Effective but costly

    • Remote controlled equipment

      • Limited effectiveness

    • Electronic resettable sectionalizers (ERS)

      • Effective and economical


Course of Action

  • Functions of ERS Devices

    • Works in conjunction with upstream reclosing protective device

    • Similar in operation as a typical sectionalizer

      • Registers current greater than its actuating level

      • Registers loss of voltage

      • Device opens on predetermined number of counts of fault current AND loss of voltage

    • 1, 2 and 3-count devices can be placed in series


Course of Action (con’t)

  • Advantages of ERS Devices

    • Allow temporary faults to clear without experiencing a sustained interruption

    • Less expensive alternative to reclosers to isolate faulted (sustained) sections of conductor

    • Fits into standard fuse cutout body

    • Simple to install and implement

    • Ideal for replacing existing fuses


Course of Action (con’t)

  • Safety Concerns on ERS Devices

    • Must be used in conjunction with an upstream reclosing protective device

    • Cannot be blindly used to replace fuses

    • Detailed engineering analysis must be performed prior to implementing

    • Lack of familiarity by line crews on the operation of ERS devices


Course of Action (con’t)

  • Implemented by Early 2006

    • Protection analysis conducted by engineering

    • Breaker coordination with hydraulic reclosers

    • HK-04

      • 3 hydraulic reclosers installed

      • 9 fuses replaced with ERS devices

    • HK-06

      • 1 hydraulic recloser installed

      • 5 fuses replaced with ERS devices


Hockley-04 Oneline


Recloser 127Z


Sectionalizer 112N


Hockley-06 Oneline


Course of Action (con’t)

  • Education

    • Line crews trained on application

    • Article published in company-wide newsletter

    • Stenciling nomenclature (###N or N###)


Stenciling Nomenclature


Performance Results for 2006

  • HK-04 and HK-06

    • 47% combined decrease in SAIDI values

    • Neither repeated as 10% SAIDI circuits

  • Pilot program deemed successful

  • CPE approved the deployment of ERS devices on other circuits


Performance Results for 2007

  • HK-06 was not a 2007 10% SAIDI circuit

  • HK-04 was a 2007 10% SAIDI circuit

    • 16% of total circuit SAIDI mins from potential temporary events behind line fuses

    • Trees, collisions, material failures and unknown causes also contributed to SAIDI mins


Questions?


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